West has been open in the past about how uncomfortable she felt during pregnancy, and specifically mentioned weight gain as playing a major role in that discomfort — which may explain the enthusiastic "Yaaaassssss!!!!" she posted to Snapchat.
That said, weight gain is a totally normal and healthy part of pregnancy — the American Congress of Obstetricians and Gynecologists recommends that normal-weight women gain between 25 and 35 pounds and that overweight women gain between 15 and 25. Many women (upwards of 50% of moms-to-be) gain more.
